4-Digit Subtraction Sentences

Subtraction Equations: Learn

An equation is a mathematical statement such that the expression on the
left side of the equals sign (=) has the same value as the expression on
the right side. An example of an equation is 6000 - 4000 = 2000.

One of the terms in an equation may not be know and needs to be
determined. Often this unknown term is represented by a letter such as
x. (e.g. x - 4000 = 2000).

The solution of an equation is finding the value of the unknown x. To
find the value of x we can use the additive equation property which says:
The two sides of an equation remain equal if the same number is added to
each side.

Example:

x

-

5000

=

7000

+5000

+5000

x

=

12000

Check the answer by substituting (12000) for x in the original equation.
The answer is correct if the expressions on each side of the equals sign
have the same value.